An application running with composing video from CSI for several days or more, software(including linux) down was found 1~2 times in 5~10 devices, screen is black with some lines flash, mouse and keyboard is not functioned, no output in debug UART, no data traffic in network output, when connecting the faulted device in a switch, network communication will be broken for all other normal devices in the same switch. No log found in linux when restart the device. the CPU temperature is normal.

You are using a small embedded device; it will be necessary to confirm with your device manufacturer the compatible operating systems. On embedded devices the manufacturers provide the drivers, the issue with the video software and network might be related to compatibility.

Now, in regards to log errors, I suggest you to get in touch with your Linux OS support and request the steps necessary to follow in order to get them.

We didn't used an offical linux distribution but built Linux from Yocto-1.5( poky-dora-10.0.0.tar.bz2 ), kernel was replaced by 3.8.0. For drivers, most of them are from Ycoto-1.5, except MIPI CSI driver from Fedora 18, and video driver is Intel_BYT_FC18_CED-LITE32_V36-1-23_RC_2014-09-03_3790.tar from an Intel FE.